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| US4222684 | 25 Oct 1978 | 16 Sep 1980 | | Method of driving sheet piles into a rock substratum | | US6368021 | 13 May 1999 | 9 Abr 2002 | Liberty Offshore, Ltd. | Pile and method for installing same | | US6536993 | 21 Feb 2002 | 25 Mar 2003 | Liberty Offshore, Ltd. | Pile and method for installing same |
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